Question: if people have the same blood type does it mean they're related? :D xoxoxoxoxo

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  1. not really. there are only 4 blood types (A, B, AB, 0) .
    Blood type test were used in Paternity testing (before DNA) , and they can exclude but not confirm paternity.
    I.e.
    if mother is A, father is B
    a kid can be A, B, AB.
    but if a kid is 0, that means that the father is not the biological father (obviously assuming that mother is the biological mother).

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